java跨域解决方式

public void findFileNet(HttpServletRequest request, HttpServletResponse response){
      String fileNetUrl = request.getParameter("Url");
      URL url;
      InputStream is;
      try {
            url = new URL(fileNetUrl);
            is = url.openStream();
            byte[] b = new byte[is.available()];
            is.read(b);
            response.getOutputStream().write(b);
            is.close(); 
     } catch (IOException e) {
            logger.info(ExceptionUtils.getStackTrace(e));
}